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P. N. DU BOIS.

y MACHINE FOR MAKING LEAD TRAPS. No. 321,955. Patented July 14, 1885.

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UNire STATES PATENT Fries,

FREDERICK N. DU BOIS, OF-NEXV YORK, N. Y.

MACHINE FOR MAKING LEAD TRAPS.

SPECIFICATION forming part of Letters Patent No, 321,955, dated July 14, 1385.

Application fi1CdD\ ccmber 26, 1894. (N0 lllOll('1.)

To all whom, it may concern:

Be it known that I, FREDERICK N. DU 1301s, of the city, county, and State of New York, have made new. and useful Improvements in Machines for Making Lead Traps, such as are commonly called Plumbers Traps, of which the following is a specification.

I have heretofore taken out Letters Patent for other improvements in apparatus for inak ing plumbers lead traps, in which the work of manufacture is performed by means of two hydraulic rams, arranged in the same axial line with lead chambers, upon which the rams act in such manner as to expel the lead in two independent streams, which converge and are made to unite and issue in a single tube from a die. The bends, which are an essential feature of such traps, are made by increasing or diminishing the How of water to the respective hydraulic presses by means of a valvular system controlling the flow of the water, so as to increase the rate of travel of one of the rams, and correspondingly decrease the rate of travel of the other at the will of the opera tor. While the rams are being driven forward into the lead-cylinders at equal speed the lead expelled from the die by their action will issue uniformly around the entire annular space, and tle emerging pipe will consequently be straight. When, by shifting the valves, water is shut off from one ram and the supply to the other is similarly increased, it follows that the rams no longer move toward one another at a uniform speed, but one will move faster than the other. It follows that, as more lead is expelled on one side of the die than on the other, the pipe will, as it forms, be curved toward the side where the least lead is supplied. By thus shifting the valves the pipe may be made curved or straight, at pleasure, and as many curves in opposite directions may be formed as are desired.

It is evident that the degree of curvature will depend upon the difference in relative speeds given to the two rams, and the curve will be long or short, as the action of the water on the rams is prompt or not.

It is generally desirable that plumbers traps should be compact, so as not to occupy any unnecessary space.

When I commenced manufacturing traps in this manner, I had great difficulty in making the bends short enough to satisfy the demand of the trade. I found that the movement of the rams did not instantly respond to changes in the positions of the valves, and this laggard action was due to the elasticity of the frame-work, which, yielding to the enormous pressure, caused changes to take place to such an extent that when the pressure on one side was relaxed and increased on the other, it took a certain length of time for the parts to accommodate themselves to the new conditions of pressure, the lead continuing to be forced out on one side, so that the movement of the lead did not change instantly with the shift ing of the valves, but, continuing to emerge, the bends were longer than they should be.

The first device adopted to change the action of the machine in this respect wasto putonto the water-pipe, valves with a minute opening, the valves being operated by hand-wheels placed near the operator, who, when he had shifted the valves regulating the inflow, immediately opened the valve on the side of diminished pressure and permitted a small escape of water, sufficient to compensate for the shrinkage of the frame of the machine. By this means I overcame to some degree the dit' ficulty mentioned, and made traps with shorter bends. This, however, added very considerablyto the care and work of the operator, and be-- sides a certain time was always wasted in passing his hand from the one set of valves to the other, and during this time the lead was emerging, and still the bends were longer than they ought to be. I then adopted treadles to actuate the valves. This enabled the operator to act more promptly in opening the relief-valve and so to produce shorter bends, but still remained the increased work and care in operating the machine. Finally, I adopted the invention which is the subject of the present application. This consists in the use of a valve which adjustably controls a minute orifice opening out of the feed-pipes for water, left constantly open, the waste of which is provided for by an increased supply of feed-water from the forcing-pumps. When this valve has been properly regulated in reference to the curvature of a particular size or kind of trap, the valve will need no further attention from the operator until the size or kind of trap is changed, when the valves must be adapted thereto. It is in this use of an adjustable permanent overflow that my invention is distinguished from that organization in which a valve is employed, which requires to be opened and closed with every change of speed in the rams.

I11 the annexed drawings, making part of this specification, I have set forth the invention as applied to my trap-making machine.

Figure 1 is a plan view showing the arrangement of parts forming the press and valves. Fig. 2 is a vertical longitudinal section showing the adjustable valve as attached to the feed water-pipes of the press.

The same letters are employed in the respective figures in the indication of identical parts.

Aisthe lead-chamber constructed, as represented in my former patents, with two independent ductsbringing the convergentstreams of lead to the common orifice; B B, two hydraulic presses the rams of which respectively actuate the independent streams of lead. 0 (J arethe feed-water pipes leading from the foreing-pumps to the cylinder. At D, I place a valve-gear, which is organized to act at one movement of the hand to open one water-way, and at the same time and to the same degree close the other, so that as one ram is accelerated the other will be correspondingly retarded.

At any point in the water-pipes O and 0, between the valves which regulate the flow of water and the cylinders, Iplaee in each a section, E, having a tube forming part of the feed-pipe, and a stem, E, at right angles thereto, containing an overfiow-chamber connected to the interior of the water-pipe by a small opening, and formed with a valveseat where such opening communicates with the valvechamber. This chamber is closed at its outer end by a screw-plug, F, screwed firmly down upon a shouldcr,F,to form awater-tightjoint.

In the center of the plug F is a threaded hole to receive the fine-threaded valve-stem, G, the lower end of which is tapered to fit the scat G. H isa waste-waterpipe leading from the chamher.

In operating'the machine with the overflowrclief, the valve G- is set by the operator to al and rapidly enlarged would permit the use of 60 more minute openings, even if it were not so necessary to readjust the overflow to adapt the machine for working on different forms or sizes of traps.

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

1. I11 a machine for making lead traps, in combination with independent hydraulic presses and valve-gear for regulating the feedwater to each cylinder, variably and oppositely, so as to give the rams different speeds, adjustable constant overflow-openings on the feed-water pipes, substantially as set forth.

2. In a machine for making lead traps, in combination with independent hydraulic presses and valve gear for operating them variably and oppositely, the chamber in stem E, plug F, adjustable valve G, and wastewater escape II, sul'istantially as set forth.

Executed in presence of two subscribing witnesses.

FREDE LICK N. DU BOIS.

Vv'itnesses:

WM. V. SIMPSON, I). S. Tonmav. 

